The state's borders will be open to all Australian states from 12.01am on Thursday.
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Premier Peter Gutwein said South Australia would be reclassified as a low-risk area from then which would mean travellers to the state could avoid mandatory quarantine, except for those linked to certain high-risk places or premises.
"This is a significant milestone," he told Parliament on Tuesday.
"This will mean for the first time in nine months, Tasmania's borders will be relaxed with all states and territories as well as New Zealanders."
Travellers from South Australia to Tasmania earlier this month were required to go into 14 days of mandatory quarantine due to a COVID-19 outbreak in the state.
Seasonal workers will arrive in Tasmania from Wednesday.
Workers are required to quarantine in a government-run hotel for two weeks on arrival which will be paid for by the government.
They are required to take COVID test on days one, five and 10 during quarantine and to return a negative result before they leave the hotel.
These are the same oligations for passengers to arrive on the first international mercy flight from New Dehli to the state over the weekend.
Tasmania has agreed to take in up to 450 people over three mercy flights.
Mr Gutwein on Tuesday said contact tracing requirements would be broadened from December 15.
Places of worship, cinemas, entertainment venues, casinos, gaming galleries, and museums will need to have a register of patrons as is the current requirement for hospitality venues.